package com.bjsxt.base.conn009_AtomicInteger;

import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class MyQueue2 {
    // 1 需要一个承装元素的集合
    private LinkedList<Object> list = new LinkedList<>();
    // 2 在这里需要一个计数器
    private AtomicInteger count = new AtomicInteger(0);
    // 3 需要指定上限和下限
    private final int minSize = 0;
    private final int maxSize;
    // 4 构造方法
    public MyQueue2(int size) {
        this.maxSize = size;
    }
    // 5 初始化一个对象用于加锁
    private final Object lock = new Object();

    public void put(Object object) {
        synchronized (lock) {
            while (count.get() == this.maxSize) {
                try {
                    lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            // 1 加入元素
            list.add(object);
            // 2 计数器累加
            count.incrementAndGet();
            // 通知另外线程（唤醒）
            lock.notify();
            System.out.println("新加入的元素为：" + object);
        }
    }

    public Object take() {
        Object ret = null;
        synchronized (lock) {
            while (count.get() == this.minSize) {
                try {
                    lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            // 1 做移除元素操作
            ret = list.removeFirst();
            // 2 计数器
            count.decrementAndGet();
            // 3 唤醒另外的线程
            lock.notify();
        }
        return ret;
    }

    public int getSize() {
        return this.count.get();
    }

    public static void main(String[] args) {
        final MyQueue2 mq = new MyQueue2(5);
        mq.put("a");
        mq.put("b");
        mq.put("c");
        mq.put("d");
        mq.put("e");
        System.out.println("当前容器长度：" + mq.getSize());
        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                mq.put("f");
                mq.put("g");
            }
        }, "t1");
        t1.start();
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                Object o1 = mq.take();
                System.out.println("移除的元素为：" + o1);
                Object o2 = mq.take();
                System.out.println("移除的元素为：" + o2);
            }
        }, "t2");
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        t2.start();
    }
}
